Die-stock.



H. WLOSTER; DIE STOGK. APPLICATION FILED APR. 22, 1912,

1,044581 O. Pa-tented Nov. 19,1912.

H RMAN w.

or CLEVELAND, or io, ASSIGNOR r0 THE osrnn MANUFACTURING or cLiivnLANi), 01110, A CORPORATION or 01110.

OSTEB, COMPANY,

DIE-STOCK.

Specification of Letters Patent. Patented N 19 1912 Application filed April 22, 1912. Serial 4 which are fixed to the top edges of the die case so as to overhang-and engage the die therein.

Fixed to the flange 2 and proj eoting rearward therefrom are a plurality of arms 2. Levers 6 are pivote to said arms by means ofpivots (5. From the pivotal point thereof the two arms of each lever are extended at a slight inclination to each other and toward the axis of t e tool. The upper end of each lever passes through a slot 2 in the flange 2 and into a recess in the rear face of the associated die case,- this recess and engaging end of the lever being curved to fit one another under all conditions of use.

On the work holder, and they may be fixed thereto or rotatably thereon, but must not be longitudinally movable thereon, are two annular bearing shoulders 7 ,7. These may be, and preferably are, the upper and lower outer edges of a ring ow the arms of levers 6 are so disposed with respect to eac other and these bearing shoulders, that the upper arm will always engage the shoulders ,2 a and the lower arm will always engage the shoulder 7, whatever may be the position of the die carrier relative to the work Be it known that I, HERMAN V. OSTER, a residing at Cleveland, in State of Ohio, and useful Improvement in Die-Stocks, which the following is a full, clear, and act description. 7

The object of this invention is to produce a cheap, durable and efioient receding die stock.

The resides moving the dies, die carrier and novel characteristic of the invention in the employment, as the means for and controlling the movement 0 of levers which are pivoted to the engage directly or indirectly with the dies, and also engage, on opposite sides of their pivots, with two annular shoulders carried by he work holder, subs antially as shown in the drawing, and hereinafter described and pointed out in the appended claim.

In the drawing,Figure 1 is acentral longitudinal sectional which the is a front end view thereof.

The work holder 1 is of familiar construction, be'ng a built up member of tubuholder- But as the die carrier ls sclewed lar form, so that the pipe or other cyl' into the work holder, the upper inclined arm drical piece of work to be threaded may be of the lever moving n contact with the passed through it, and being provi ed with shoulder 7? will cause said lever to be rocked, suitable means whereby it may be clampe moving said front arm away rom the axis of the tool, and this will, of course, cause a The die carrier 2 is likewise corresponding movement of the die case and and is capable of moving rotatively and longitudinally relative to th work die carried thereby. At the same time the holder. In the construction shown the die rear arm 0 the lever 6 will always engage carrier has its rear end externally threaded Wlth the shoulders 7 but, as these two parts so th t it, ay b screws mt the inter y move longitudmally relative to each other, th d d k h ld wh refor as the re and since the rear cut of the lever is inclined carrier is turned relatively to the work as shown, said rear end of the lever will be holder, it will move longitudinally relative permitted to swing toward the axis of the th t 1; u h a r as i determine by tool. In other words the shoulder 7*, by enthe pitch of the engaging threads upon these gagement with therear lever arm will serve two parts. to limitsuch receding movement of the dies At the front end of the die carrier is an and die cases as is produced by the outoutwardly extended flange 2 which is prothrustof the dies upon thework Practical vided with a plurality of pairs of forwardly conditions, however, arise in which it is not projecting lugs 2, 2 between which are safe to rely upon the out-thrust of the work guideways for the die cases 4:, which he beto produce the required outward or receding tween them. These die cases have ribs l on movement of the dies. The shoulder 7, how- 1051 their sides which go into grooves in e ever, by its engagement with the front arm inner faces of the lugs. The dies 3 are fiX: of lever 6 compels the dies to move, an edly held in these die cases. The rear en therefore an absolutely regular and con of each abuts a shoulder P on the associate trolled movement of the dies is produced undie case; and the die is held down by gibs der all conditions. Moreover, when the die said Work holder, radially movable dies carried by the die carhe die carrier and ex- Copies of this patent may be obtained for five cents Washington,

front end thereof rearward alongside of the Work holder, levers Which are pivoted to said arms, extended on both sides of its pivot at a small the axis of the ie carrier, and

der which refaces of both means tran HERMAN W. OSTER.

Witnesses: H. R. SULLIVAN, E. L. THURSTON- each, by addressing the Commissioner of Patents,

eaeh lever being 2 

